What to read after Trapped in the Tower?

Luke and Garrett befriend Three Leaning Trees, the son of Chief Black Stone of the Nektosha Indian settlement. One evening, the adventurous three boys encounter something sinister in the dark woods. Their adventure continues the next day inside a soaring tower on the banks of Cobblestone Island. While climbing the tower's winding stairs, they are surprised by a bat flying through a broken window and a snake-like form trailing away from a trap door. At the top of the tower, the boys make an important discovery. After their climb back down, they are met with even more surprises! A mysterious sighting on the lake, disappearing objects, a curious chocolate-making machine, and a dangerous shipwreck all add to the adventures. Three Leaning Trees shows Luke and Garrett his father's peace pipe. On Thanksgiving Day in 1884, the boys attend a dimly-lit ceremony inside a Nektosha wigwam. The peace pipe becomes a central object in teaching Luke to be more patient. As he understands that patience is a Fruit of the Spirit, Luke recognizes that Garrett's gentleness is also a gift from God meant for all "Children of the Light." Based on the Fruit of the Spirit Galatians 5: 22-23 See how each Fruit of the Spirit is discovered in the lives and adventures of the nine children of the Light. The third book in the series focuses on long-suffering (patience) and gentleness. Nine kids. Nine gifts. Nine blessed. childrenofthelightbooks.com